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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7b7f5359fb3186191ea5debc920bb8ee6fd5ff35d0ac959ab8a1b1fa9f3d98' 
  AND token = 'c3CIY/P/wnY5Kz3Mpb34OqsJy45bFeEPVaULQMsBtKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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