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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032dd05982c21828d3da4799dc98cbbba4b332fa6518a3ec0d3f2f2eb4772b15' 
  AND token = '1r2MrjNVvxhsXDsCnS40FWd0kBVo3Z3tCQeeWNLf6OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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