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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad8dcdf95495ba8f95f23335f657f056804437c48fe90ad8b62a92e43dbd16d' 
  AND token = '5NGfRNsGIEyrPzzLKFtgVC09kHzh3t7UbzBEB3eikqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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