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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad08d7cbd1a170f2c5d9dfc91de4448a4c702979ecdb8282c76dc644b881988b' 
  AND token = 'PSied4gYRuo6QZVBaTZS98cr8/XMBwe5tMk7wUD0wY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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