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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ffbdf6548927abc29f1ac78a4f51e2f3ccea11214a9407e16c0af457bbf3c0' 
  AND token = 'qgkoR4eZZoIrVy74UkMbKkRA40Jrdz7NJaVbonfOWNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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