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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2d2a6808f092ef8a0210fc4eb26189d34377b64932548b1a869e01e8b02ea2' 
  AND token = '/4+v4ZjmevWvNl8ax+WD5FY1S8Z0kSIxUbn/O+Gi5OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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