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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba929eb891ca7d7c95c0ff54d5d00056c49348e493b8359b0a8cadedbd61e4f4' 
  AND token = 'NY1hmz5/w7W44mr8jTcNhDWDezpQ/qghLBEjLjlNOfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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