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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9e00ffe08fdb800f2315b0dfcec91af571e678063b7d39526408f435022751' 
  AND token = '0XEVhnzRivC/izDqbMYLzVF4WDVVXCefS8KB2jdLtCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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