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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa16532dcf29826271c80e3e0d7177477cd882265f7e16928b21ffdf7f72bc24' 
  AND token = 'IKjX7bBpNDK64JeC0xByBFVM3CRW/JRE3gjZTtTf+S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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