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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a315b8663475496287108ff6ac063de449f329f05ee133623222b2acc6f2594a' 
  AND token = 'GtXVN5Mtee77am0NyBMHBlAA8TcTf1P3FqUncR0BisQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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