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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac59f6768a8ceb9e387dd1f0815b7e98207a6e2ae7c7c35c5af233ba7d95166c' 
  AND token = 'IOeiR1hscmXRmd+/OdKUr9hFkMTn0/r7KNrmOVDVvz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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