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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6750df72f25f06eccaa6c14333d3fd42f157817af76a4e98d03f0a553e646c3' 
  AND token = 'CZg4Q3ko2EBvHEiWV8xmDNDfUIRn+vV5KoHeb02h76I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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