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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f69ee9698ce7fc83ce0b92846aa5e8034049dc8d57cfeb3df79ea0b75c6964' 
  AND token = 'g5HoSdnhLO9twwPYuh6eLbVKt3/vdqvRb2OAN6qRaVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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