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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f2bcf5dcdae31a71f0ad3d401aabea810b2a3010235f96b19dbfc9faac79431' 
  AND token = 'IVx95ulhiXrKZ4xwwzkjUfQv3qGvNVVCdhe/D0wabr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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