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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa540090df4fc0cb1add2e4fd5fe41255a3306946e7d9a02d42fc24e32cb17d6' 
  AND token = 'c2b3QQlfx7NkXohgvvAnv7/45trRSMg7zvpJ6lUnW74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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