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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b0598c836b2174d57c8bb19d447bd05ff4db4f323f6fea8e140a9a8df57a6f' 
  AND token = '2Q1KmLnYQOrNd13sIXnnK9hqfn6eUJcxi1EJJvTziKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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