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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b35fe123e0a1f7b8af2e9a2e2a5aab55a2b2d7ef7ee674ac011a7e9c2f4e9cca' 
  AND token = 'hLWyzeiJI3a8MlOyx4TBGP5iPNqESafNk44+gxYile0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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