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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cd64cbf36f04ab2bda353236d65f6156ae1f58d50da61cbf9dd3c5b76e76f9' 
  AND token = '9z/QEriUDQOw7P047lAlsKjf/19QzFicl0mH8a9tC9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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