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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a086b90e9b6ade36bb7e47b886928d4f806341f12b2dbb488c6065d2e8baf8' 
  AND token = 'G6/92GAlJTl7fVIYQ2NzguA7IuGqKbSbMl5O8GCE840=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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