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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478ed1f65cc19a46a352b183341d5a59a3bb6e479b54c7c4b4a58f6916e5d831' 
  AND token = 'k5w9kDrwCMqxF/3pUnEjQ4mYuWMWHflNTEyu9Z8W8H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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