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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ff588d7dae4088eb3256f3ac15b0de73e662cc82e29dc603dd7f0aaede54fa' 
  AND token = 'S/vmuK8M7ftpfEQXCohzybSwzSQqyRQz0n5P5kbDL4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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