SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d7f9896d5f3868cce496cbab601ef013a5ea254e92c0cb216530b134673a25' 
  AND token = '0e4SwaKG+Mm0CUNVKqdjQkWNzr1hqXgWgMQ66Ld/p2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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