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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f347c58cb1545956643656bae72cb449dd7fbe6dea873015fdae4e9722d4c9' 
  AND token = '1oBsR0DB7KmGtuT0sQDiRl0pNWLLBBi5ShvWHK6vErc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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