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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995b166a51a6a397931a19e233eee2d34e83d2f8f13a37475d303d7c912eaaa2' 
  AND token = 'n77ObSyRDt0N0U8kZcGFpc02Pxczxs8tv21aUSEGhrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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