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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f47126d345f3ee462fd6f137b9a25c516da95948c96748149c63407bcbb7c84' 
  AND token = 'COk32rRF9O5N+HkLI/BQmxny0JY7xN8su6RRBmiQo3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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