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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d5e58299169bad21edf80c12ee7fd575ad5f81e5096b75b078cd895a0f8b86' 
  AND token = 'Hmd73KUJcNsJjxzFCxyU4XBZxbP7ka1nVDTvnXsD8hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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