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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca09139ff348b639b45377c4d9ab275a2ce02f27096b4f6eff7a9691fbfbaf34' 
  AND token = 'Wn62WMtdWySI7Hp82+bHAsN8/trDy7ZkTOOiz+UW2Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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