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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c671791a688294c6fc7d50b5e252788e3038ae1889c08d816411377c69691d6' 
  AND token = '60553KFCeI4IJZQfffg6rGa86ZaJiB0l3EyeNA65fJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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