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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee6f945009576cba26fea885669c15554858ca1715d94416e16f588b1674010' 
  AND token = 'X8ybbLZy8Hk5CmfvB9qfEyjq1/XhLqP2vKy2jq8WGbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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