SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43eea66a258e73fd3dfb35c2cc642fd1f0a58b54f29f4587218cd49b0d2eb4bf' 
  AND token = 'eutgncqfwgjsGDCGWZBp4+pM/2vT4GU1ZLhd3OLqyac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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