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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e7887ebe2714b3c2baa8260bb3e76a6da50a6c17c4c684d3abe1fbb42c21c73' 
  AND token = '4iz7942bRq52IaeT0bODkbKrSX5aVXRBYrjTHxbQswI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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