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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed02e3b3cbf4e05d8620415d84c3b5bf07887fb71eff755bc77de19f062ff4a' 
  AND token = 'NHDKe5/HViA0oIYq9tSrFk3pRRC4hA19AEHqbnaSH1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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