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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82df18cd14b7ae761d52cf42e6fa68a1b09bfb7199d647d8dbfc8fa89017eff2' 
  AND token = 'k/Zkl9vZPbpvczjeFmVHq8P4yA8rS0QSY9g3rOdyI8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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