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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b52a9c5a6ea6b6121ab1636e6034b22866db4b9363251371f3927e53364fd71' 
  AND token = 'G0s7YHGp9//+lF7z4OWyxauaI7aObinh5Zpysmy5WJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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