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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02edba56e49fbac777b006bb6bcbdcdaafc2b8220f5b1990cf5dce200b60b859' 
  AND token = 'pisMzSvUQe1esjSasbqJwDsHaVCrH9payWcz2KDgFQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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