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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b45718ffcd268a1815b63a8b0996bd3190b58c557e830825e64e40381f82484' 
  AND token = 'eYSkT6NbH0YeXYooealMhuCjBDph71abbxmroMtUt+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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