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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d932cef45e20a9cffe4a66294599bb5bf662846f3df0f9c01fdc787600b1cf4' 
  AND token = 'exKb5X/7ccRyCgMPhjHZWo7OlarFqmBs7h2WoNmWNJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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