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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d7ed7f9eadc71c3d290aa36cf4a2d1cdc6ee4c28eef0917fa5c823d493b1d3' 
  AND token = 'pHidARwBbXQPSsMeUV+Z2PRuVKDO1pPN2dhmW6y1Gmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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