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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d719bcc9d45eadfd286cf758081a0165587dd867b97dc729a531423578cb1c' 
  AND token = 'JwrYGfkh7E0Jecu1FCz84NCghKEt9CMNFtKhWbqlIOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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