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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa09453757c80f9af9ad3942f5fdbf0321f22db096b6fcaf92fccd8d145b707b' 
  AND token = 'h3ckSE8b0i+Y7VeiB3tXd/2UKm49AMj7HKzIiVxCFWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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