SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efeefca961eb7f7639440587ddad797688e576b164d0f6d80dfe6118fd2fefb6' 
  AND token = 'wD+veJr+HbwYr3mmdZRnKZX42iwv9oyVJwhgOM/ITvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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