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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb00b2d7833d3f35a6b10547ea6a209584d77454840bbba5472e99a633fbe791' 
  AND token = 'PEkIgZDbR7MTicSV3cCFxSKruZoAr1yTeL02F3gOdBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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