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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3680cd9e1913773645f205b98c08396e9fc54aeb38246a45e210ca3dc6168bd2' 
  AND token = 'spWEMv+yEe6tsKUd3JoX5Ig8ezTdOGdtJTEMaBM6Gig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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