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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9b58f7f94da3adf2016ea8a1f876184d785dd53dc67f077c463f39412ce7c7' 
  AND token = 'QkFFNqHceJNg+7EVM96ermWdDdxz6Z9iRBMnladvK7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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