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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e83c8cb1d61ddb6f1ee50fe065065a30bd0329b25e482ef18f12f341dbedd62' 
  AND token = '3ylHfwO0jftU0WMWa6DExx7LDDso6QqwE9XcDf1ZJU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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