SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658d1186e43646af3514ffe8470765ee810cfc46c4c4f1aaf838c9faec09bd82' 
  AND token = 'hJj7qlQsPm3yeVwYCS2u1WLa9ESzrddzmbsppAjGZXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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