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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '753778abc8c93f700de3da9b03fcaa0a9c8d3c0a1dffea6cae78eb023c4e71c0' 
  AND token = 'EvLxA1Q34M9YIGl50A00z5uqDTW2tERpy6kuNtEvD/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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