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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea311c49304eb9f319aaf49d18ca81bc9e81d97ef46634634aed30c48c45aba6' 
  AND token = '3IgaXCm7QUF4g7tWU7oGs6/w00QeWYmhgt+oTIvqYro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}