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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0423ba932cc0c6f6c8e7bbd881c3bca9d6720ae9629fa6ecd7aa87392ce9b60e' 
  AND token = '82olUaYFMySArFx/G/6/h+F6tnhoaZv8212cMzakElk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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