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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102999af104552cee3ec8a987f9a8ffa1c2b24ea97a9bf8a5998ea506ed5c007' 
  AND token = '/7N3Ykww9zqV9ERo9BuivwTKP8rBSYpvJKCdKeHbqtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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