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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f175c1243bf496c3e7b7b75b4b964b3b51a55de129c8d5426af4a1f80b368a78' 
  AND token = '7qF4DjIxWq1qdjEIttTa/2yX782Xii41SjrLD87PSd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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