SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d881562bc655b1029021985ee6fbd118a49d3ec4fbb8c7c79420dcf7870d4b0' 
  AND token = 'wJJsunOxygqcSLsu5dUTvipZLFmoaaKdp2rKlqQnVCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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