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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c7c7ea62ac67d75f1ec406324dc96798ac5d53c7150212ef9c6c7d2198813ce' 
  AND token = 'bNxepDvJ3keXLaHP931qtPlDZGbdfSLynr6FB72kbjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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