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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1531df0cb642ed462af1bfac904d75317060eebc83218bc9b4f441542155d7' 
  AND token = '4Ye78F6pUZMJ73umgEkLRrIessfbOJtwwGG9Ye/1kXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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