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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd18b39d7bfcfb70397cf5f3e45c731addfe3418a61b091e057cbb98c93ca51' 
  AND token = 'GFX0oYtVt0AqtE47Ka8Lnf1Te9SERvSI0/uPPnD63FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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