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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca25954b111906a73e1d7de6f4b87d3d4ecc227ebf8d27e11586e64c4867c200' 
  AND token = 'Lshj9uggWq0Bm5a1hUZh4jHXuMReAI3WmRQgn6P7d28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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