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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985caa21f0136335e7a6c10dee285158a0ba8558a243977a89d9df71e2d1f288' 
  AND token = '1Vr/e+krExCN6Zv1UhP3YOa5KKo6bDH9r+emxfdk84k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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