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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6aff8aeb9cf5fa5117e511fd36ce1ff6bd9d72963ee7100fc43f652ba4ec99' 
  AND token = 'NZr9GUe1qLF3FiQsaVbebeOYQob8W16bxPJSq53u5pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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