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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb4b3c1a7a6e2d8d8d07539977cf517f094a34d5ca99880c08be07f33a9b3d6' 
  AND token = 'ie/b98FTvT/WxvuDFBPqSt9idniQ9rRParLy/xEY+Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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