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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade41eaeca7dd720e326f70c26ff109ef41c9a6d77af3244ff0351aa73f61922' 
  AND token = 'WdNALdsv+WTWnXoQVYuTjPasmwm4CwxhJYRbwcNcA0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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