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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f7f0b49d5654787781616e41e7e2f85bfcfd0ffd8849701e861c03155b5927' 
  AND token = 'idPm/5CiTzWaH5f6ljYHjOJQPiEpK5EzsAjx6+9/1wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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