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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be86f5b2387c547e5520fb75cf5291722b6186f748979db46c648038c86340b' 
  AND token = 'J7deffOCiich7KYYnSqz0maZft+R3CkRdSNpHS9qWs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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