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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3de632036ada7756f3837f60f57e85bc4d00e6144632ef83e16fecf7651fff' 
  AND token = 'QzwJ1IYODgj0ouq8X8olDsjnJRxMnexqa5MV2BaLm1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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