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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651b723c65f7008e036e5f5fdf52dfdf733faf1fe7a6dc3714f97e21a755ef6d' 
  AND token = 'UOUAtOjyweI5Qsq4byEDeuT5Pd0VkAQzcNEtCYCqn6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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