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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6108dc05613a0c1f69b31af835d1c7e23e24f7d6feeb83f244b65e9a20fe23e' 
  AND token = 'XDOQqWUa26UKAKVkZc0dpb9YPKLw839mccaU41UYT8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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