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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6f92e927d061b9678542e08ed5938d502b99f1ebca96ca26b62cc9cbcc00e6' 
  AND token = 'c9tFUJGOyiWvLDOGS4PAH8VexCgG6Z7vhcodpSAo/do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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