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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8918292f67d00a56259f8ae5aee9bec5a4658b35f903473f13ee72633b3be9' 
  AND token = '6Hgjgj+p5HRivMJMLe+tSL4+cRwWfcD2lreYt6dWWUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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