SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3604f279f634d5bdb7bbd7e95267f5879cdc68cfd0ecc48e922ffcf1232c772' 
  AND token = 's1g3KGJyDBcdBZO5LX39w/X7WqL3KsCr+XM4K5eTsCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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