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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98ec959f74dceb3264cf5c05bd034b18efa5e2a112997749b93464705105ada' 
  AND token = 'm8UDGXDWsiqxa1kaW5NXKckPO1OI6tAYIxMVcwYZslE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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