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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0031ffdb29625de9b83be91e643995ecf48f6155cf3ee8061455dbdfdfd8d9f' 
  AND token = 'cDHxrKbaPtIcUquOawDUeaV1kykAz58+ZQG3d0njhNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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