SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc381eef536397c2ffe02284abd8fa3b6b488d37175cf0cb24bac5d572b6c84c' 
  AND token = 'fFzVqXEPCSoQ5lYU/Dp9W4dBfISsZsnxpmwaqFH2GuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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