SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c66465e3cf47a5f1d510b7ca908a6d9592c1823a88e7a7c52e40d4a92f2de22a' 
  AND token = 'lh7py8BlXG3ARSXTzGxL+1LYzqW21UUeVURvW8HIT/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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