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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7015d3f235ac22b8a3f4b3a35141a8a254d671de7d877ad83dfa91a1df8418ab' 
  AND token = 'kTLs34uNvTOeJWnhzlc//U7tfzz5XxWI4e2yjIDKu64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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