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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271db0868983704c782673c3c966b264c781115e0237d2e7cf250bd265a0cac1' 
  AND token = 'TINveoVOxMdXyDDJMkAvD2d9jOj+0AYH296kuhQuRrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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