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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8dec18bf954a40973034ac11d9c35a57ca161503f42d000188f739bbcd2dca2' 
  AND token = 'zRgSphg6B/ohN6LH1nE1966P2tA6Qy1ZkT/+PrbhLTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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