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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc5987f1848b4a868f2d7a6c07a341506ef97ea636cd9daf3cffe27bd75cc72' 
  AND token = '2dnjiz9wnEUj3+8oXo+NAyICVf0+Z2V/0ZM52pp9IPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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