SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1cfaa4153853fa4c76cc481ae82f3b6699fe6c28c195b3d310b115f36720658' 
  AND token = 'eJ3LDHL5uZzMLRyiYhvWC1wB/w1bJgQeuOKEULTQXg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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