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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df14684e23b28f9539a8e927b70b68089c8e0895ba5568e24b511d9e1489476f' 
  AND token = '3BHwaozkD1WGJB5t86utHK0TybOC9gcnIhRwQZabZ04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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