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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1f062dd232eff16612a369a420d74d27715f92e1d2fd8da3a61760da02ac65' 
  AND token = '35su9SBnS8NeYLQPrP3yQ4DsRzKbuS3y4BgIMsHFJgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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