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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a4e16844763d1970618dc90d0f4877247c08fbac488bcb34693baaa21af4cd' 
  AND token = 'vnVy1W55FdM/7W++We27g2WqOiWgrryXRwLC37+lVuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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