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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085e9dcd2bb2c2e4ea1ed1e06b2495c5bb68ade721b406829f5278e66ec4754a' 
  AND token = '+WegFcdsKhQ9we2EIYoRoNe3es/qSAcqVWxG0egBHTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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