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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9839e7e1820a1f6b860b0abb33494693e16e819072675a7ecb2cb4f55a2f368e' 
  AND token = 'yeVvrGOfUcQp4SVkvTsjQv9UPI8UhIxilsgVBM/ar6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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