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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed23dc026733c4a63f779f79e7e84fd3e059cc4c02f67e592b810d48e192c4a' 
  AND token = 'Hd38E2S4lNYmBYbhAR+ZQlgZ6X0IICkK8fzNaMONbno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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