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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6f511e8a91179383649e5a50ad384bb2b2892cebb513163f532cd91dd52b4d' 
  AND token = 'wQTtUdxw0Ox1quPRDk7Ird3gkm+OTRjUsJyby2XA5SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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