SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5003f1c1bd627a3e60db82a337ee5fdf322aa1a35ce77c45b214aefe5d92f7a' 
  AND token = 'gJ4cPlauwDqijkFZzFuhd4+xvBsvluN8J57gCH8nUzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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