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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931e618a288a96ea8b219ca3a4a3542929803c2d3421a25bb7b720033f5bcb62' 
  AND token = 'QJyZ2M12v7Izz9MOSTdSs8PUTNN1qQyV35wjiA89XZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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