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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce122b156d3ce3666cba719df4c44a50991b84e8247900cc43cecf2df800dd81' 
  AND token = 'ibN3epdDGE+gD5uNYpWD1eaF89sOWEgfTBOYbE+mBBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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