SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab969cf24a3052290d5d77fbf4177c9a7cb9098e5b6d0b55d72002e32b141139' 
  AND token = 'yrepcu6yPtKsKwzBhS0n5ZDfjhxiY1l+v+BDpcKC6mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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