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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cab257cd823d387543b9f3a23a81c597c927a442376098e7a19d64a0174523' 
  AND token = '3j2gKcNcFUJY7jgfDrb6ip3MpdHpkyXJ4qUuOsY7t+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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