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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2460cb5450ca353ddeb41fd11f26f8444e29fa6efa278ac4868057fb59e3bc' 
  AND token = 'rcdB6ton3neWeWWalDxnlwKx5oZjh7OjxjHvL/ihv1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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