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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8e94b3124a3f05efc9620295c54859c514996e8f894d70a4790d9ed269b0db' 
  AND token = 'KXkUKWrK+Lvqu1/Cqrz8l8C1tpxFMs0g3tMVaI/T2nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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