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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbfc7247a5d0f1dee0e89019ccb34efaff9d9d8831984d0abfe9af5b1c3d1a4' 
  AND token = 'nBzumom2WmGkiKqMIL7hBI9wElCysmwuglsAP7uvI34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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